test old runner

Signed-off-by: Yuanjing Xue <197832395+yuanjingx87@users.noreply.github.com>

Author: yuanjingx87

.github/workflows/test-runner.yml

@@ -61,7 +61,7 @@ on:
 jobs:
   Vulnerability-scan:
     name: Vulnerability scan (runner probe)
-    runs-on: vulnerability-scan
+    runs-on: ubuntu-latest
     steps:
       # Proves the runner picked up the job and confirms its identity/tooling.
       # This runs regardless of whether blossom args were supplied, so a bare